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RETTEW addressed persistent groundwater contamination at a Pennsylvania Department of Transportation (PennDOT) maintenance facility, stemming from previous operations involving a diesel underground storage tank. Despite PennDOT’s prior attempts, achieving regulatory closure remained an obstacle for the site. Using advanced technology, RETTEW precisely mapped volatile organic compounds, creating a detailed 3D contamination model. This informed our…
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The intersection of SR 0034, SR 0850, and Pisgah State Road in Shermans Dale was plagued with a significant number of traffic accidents. The four-legged intersection posed serious safety risks, necessitating a redesign to improve traffic flow and safety for the community. RETTEW undertook a comprehensive approach to address the intersection’s challenges. We designed a…
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Replacing this twin-barrel arch bridge on a heavily traveled corridor posed significant challenges because of the limited crossings of the waterway and the need to maintain traffic flow. RETTEW designed a two-span replacement bridge on a curved alignment to address these issues. To ensure continuous traffic flow during construction, we implemented a staged construction approach…
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RETTEW worked with Lancaster County for more than a decade to prioritize rehabilitation and replacement of their structurally deficient bridges. The Big Conestoga #1 Bridge was the last remaining bridge replacement project, allowing the County to shift their focus to maintenance and preservation of these bridges. The original Big Conestoga #1 was a reinforced-concrete through…
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Elizabethtown Borough wanted to complete the pathway network within the borough that was part of a phased planning, design, and construction project reflecting the Regional Official Map for Trails as part of the Regional Strategic Plan. This part of the project, following three previous phases, connects an existing pathway network around Elizabethtown College to the…
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RETTEW conducted a site characterization and remedial action of a former automobile service and fueling station property acquired by the Lehigh-Northampton Airport Authority (LNAA). Upon acquisition, historical regulatory obligations related to a past underground storage tank closure were identified. RETTEW conducted a comprehensive site characterization and assessment that included 13 monitoring wells, numerous soil borings,…
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Since 2015, RETTEW has provided Lehigh-Northampton Airport Authority (LNAA) and Lehigh Valley International Airport (ABE) with industrial National Pollutant Discharge Elimination System (NPDES) consulting, compliance, and permitting support. The initial project — to make the ABE stormwater program compliant with federal and state regulations with an approved NPDES PAG-03 General Permit for industrial stormwater discharge…
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The intersection of SR 172 and Perry Drive was on Ohio’s Governors priority list of the top ten most dangerous intersections in the state and needed significant upgrades to increase safety for motorists. During construction, the prime engineer required the expertise of a subconsultant to develop signal timings for phases of temporary traffic conditions. Having…
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RETTEW performed the design of this $3.1 million overhead bridge project carrying Nissley Drive (renamed Baker Avenue as part of the project) over the turnpike mainline. We completed an alternative analysis to replace this rigid-frame structure with a two-span bridge and accommodate future widening of the mainline. In addition to the structure design, RETTEW developed…
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This was the pilot bridge replacement project for the Pennsylvania Turnpike Commission’s (PTC) Bridge Information Modeling (BIM) and Digital Delivery Program, which included developing a 3D model. The existing bridge was a single-span steel beam bridge, and we proposed a two-span composite prestressed spread box-beam bridge. This project was part of a $1.5 million open-end…
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Go to NewsroomWater System Analyses Using Hydraulic Modeling for Municipal Water Systems
Hydraulic modeling is a powerful tool for municipal water systems experiencing rapid growth, and it plays a crucial…
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